Zoom lens

Details Zoom lens Zoom lens

2011-06-14

2011-06-14

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000, C359S681000, C359S682000, C359S683000, C359S684000, C359S685000, C359S686000, C359S716000, C359S753000

Reexamination Certificate

active

07961404

ABSTRACT:
A zoom lens includes, in order from an object side to an image side, a first lens unit of negative refractive power, a second lens unit of positive refractive power, and a third lens unit of positive refractive power. The zoom lens changes the distances between the lens units during zooming. The following condition is satisfied:in-line-formulae description="In-line Formulae" end="lead"?0.3<|f1/fT<0.5in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?2.3<|f1/fw<3.5,in-line-formulae description="In-line Formulae" end="tail"?where f1is a focal length of the first lens unit, fT is a focal length of the zoom lens at a telephoto end, and fw is a focal length of the zoom lens at a wide-angle end.

REFERENCES:
patent: 5684639 (1997-11-01), Ohtake
patent: 6108136 (2000-08-01), Yamanashi
patent: 20040226511 (2004-08-01), None

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